Finding the Fourth Proportional to 2,626.61, 3,939.89 and 777.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,626.61 : 3,939.89 = 777.73 : x
2. Step 2: Convert to fraction form
   2,626.61/3,939.89 = 777.73/x
3. Step 3: Cross multiply
   2,626.61x = 3,939.89 × 777.73
4. Step 4: Simplify right side
   2,626.61x = 3,064,170.65
5. Step 5: Solve for x
   x = 3,064,170.65/2,626.61
6. Step 6: Final answer
   x = 1,166.59